Battery
One full day of typical use. Some features, like Hangouts and video recording, are more battery intensive.
Charger
Included Micro USB cable and charger.

While there are thousands of Micro USB chargers out there, Glass is designed and tested with the included charger in mind. Use it and preserve long and prosperous Glass use.Compatibility
Any Bluetooth-capable phone.
The MyGlass companion app requires Android 4.0.3 (Ice Cream Sandwich) or higher. MyGlass enables GPS and SMS messaging.